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Do I have room to add a dwarf african frog?

Hi, I have a 20g tank, set up for about 6-7 months or so. I'm using the 50g aquaclear filter that filters 200gp/h at max. I do 20% water changes every two weeks and chemical tests once a month.

The tank has:
2 black tetras
1 guppy,
6 cherry barbs,
2 golden snails

I originally had mostly guppies, but the females kept dying during when they got pregnant and I eventually took all the babies to the store to get the barbs. The tetras were to help control the guppy population but I decided to keep them and the most colorful guppy.

I really want to get a dwarf African frog but will the bioload be too much for the tank? I want something in their to help clean up clean up food that falls too the floor. Plus they seem really cool! I'm not worried about compatibility since all the fish and the frog are peaceful but can my tank take the frog without problems?

If you want something to help with the food remains get a gravel vac and possibly a few cherry shrimp. Bioload of the frog should be possible but with barbs in there I'd be worried if it can compete for food.

It sounds like you may be overfeeding your fish. You shouldn't have so much "extra" food "laying" on the bottom of your tank. I would try feeding less. I know I never thought I was overfeeding, but after I started feeding only once a day and just a smaller amount, my aquarium is clearer, my perms are inline, and most important to me, my fish are much more active...always swimming around, looking for food in the substrate, and come flying up to the top when I do feed them. A lot more fun to watch then when they had an abundance of food laying around.